Feeling your own heartbeat — racing, skipping, fluttering, or pounding — is one of the most common reasons people see a cardiologist, and most of the time it turns out to be benign. But because the same sensation can also be the first sign of a rhythm problem that needs treatment, it's worth understanding how to think about it rather than either ignoring it or panicking over every skipped beat.
What Counts as a Palpitation?
A palpitation is simply an unusual awareness of your own heartbeat — it can feel like racing, pounding, fluttering, a "flip-flop," or a brief pause followed by a hard thump. It's a symptom, not a diagnosis — the same sensation can come from something completely harmless (a single extra beat, caffeine, anxiety) or from a rhythm that genuinely needs treatment (atrial fibrillation, SVT, VT), which is why the same complaint gets worked up differently depending on the details.
Common Benign Causes
- Premature beats (PACs and PVCs) — a single extra or early heartbeat, felt as a "skip" or "flip," extremely common and usually harmless in an otherwise healthy heart (see Premature Atrial & Ventricular Contractions (PACs & PVCs))
- Caffeine, alcohol, nicotine, or stimulant medications/supplements — all can trigger a temporary racing or fluttering sensation
- Anxiety and panic — a racing heart is a core physical symptom of anxiety and panic attacks, and can feel genuinely alarming even though it isn't dangerous
- Dehydration or missed meals — can cause a temporary, harmless increase in heart rate
- Fever or illness — a faster heart rate is a normal response to being sick
- Thyroid changes, anemia, or hormonal shifts (including pregnancy and menopause) — can all cause a sensation of a racing or pounding heart
- Poor sleep or exhaustion
When It Might Be a True Arrhythmia
Certain patterns point toward an actual rhythm disorder rather than a benign trigger — none of these confirm a diagnosis on their own, but they're the details your care team will ask about:
- A racing sensation that starts and stops suddenly, rather than gradually ramping up and down
- Palpitations lasting more than a few minutes, especially if regularly fast (over roughly 150 beats per minute)
- Palpitations accompanied by chest pain, shortness of breath, dizziness, or fainting
- A known history of heart disease, prior heart attack, heart failure, or a structural heart problem
- A strong family history of arrhythmia or sudden cardiac death at a young age
- Palpitations that happen during exercise, rather than at rest
How It's Evaluated
Because most arrhythmias come and go, catching one "in the act" on a recording is usually the key to a diagnosis:
- ECG — a snapshot; often normal if you're not having symptoms at that exact moment (see Cardiac Testing & Imaging)
- Ambulatory rhythm monitoring — a Holter monitor, extended patch, event monitor, or implantable loop recorder worn over days to months, matched to how often your symptoms occur (see Cardiac Testing & Imaging)
- Blood work — checking thyroid function, electrolytes, and a blood count, since abnormalities in any of these can cause or worsen palpitations
- Echocardiogram — assesses for an underlying structural cause, especially if a true arrhythmia is found or suspected
The Specific Rhythms Behind True Arrhythmias
If a genuine arrhythmia is found, it typically falls into one of these categories, each with its own dedicated page covering causes, treatment, and outlook:
- Atrial Fibrillation — the most common sustained arrhythmia, an irregular and often fast rhythm from the heart's upper chambers
- Atrial Flutter — a fast, very regular rhythm closely related to atrial fibrillation
- Supraventricular Tachycardia (SVT) — sudden episodes of a very fast, regular heart rate starting above the ventricles
- Ventricular Tachycardia (VT) — a fast rhythm starting in the lower chambers, which can range from benign to life-threatening depending on the underlying heart condition
- Premature Atrial & Ventricular Contractions (PACs & PVCs) — single extra beats, usually benign but occasionally frequent enough to need treatment
Living With It
Many people who have palpitations investigated are reassured to learn the cause is benign — and for those with an underlying rhythm disorder, most are very manageable with the right combination of monitoring, medication, or procedures. Keeping a simple log of when palpitations happen, how long they last, and what you were doing at the time is one of the most useful things you can bring to an appointment, since it helps your care team match your symptom pattern to the right type of monitoring.
When to Call Your Doctor vs. Go to the ER
- New or increasing palpitations, even if brief
- Palpitations that happen consistently with a specific trigger you'd like evaluated
- Palpitations with chest pain, fainting, or severe shortness of breath
- A very fast, sustained racing heart rate that doesn't resolve on its own
Common Questions
Should I be worried about every skipped beat?
No — occasional single skipped beats (PACs/PVCs) are extremely common and usually harmless, especially in an otherwise healthy heart; a pattern that's frequent, prolonged, or accompanied by other symptoms is what warrants evaluation.
Can anxiety really cause a racing heart, or is that just an excuse?
It's genuinely physical — anxiety triggers real physiological changes (adrenaline release, faster heart rate) that can feel identical to a cardiac cause, which is exactly why both possibilities are taken seriously rather than one being dismissed in favor of the other.
My smartwatch flagged an irregular rhythm — what should I do?
Bring it to your care team's attention rather than panicking or ignoring it; it's a useful screening prompt but not a diagnosis on its own (see Cardiac Home Monitoring Equipment).
Do I need to give up caffeine completely?
Not usually — for most people, moderating rather than eliminating caffeine is enough; your care team can help you figure out if you're especially sensitive to it.